Direct Vent (Dual Pipe ) Piping - Goodman GMV9 Installation & Operating Instructions Manual

Non-Direct Vent (Single Pipe)
Maximum Allow able Length of Vent/Flue Pipe (ft)
Pipe (4)
Unit Input
(inch)
1
45,000 2 71
2 49
70,000
3 71
90,000 3 71
115,000 3 49
COUNTERFLOW
Non-Direct Vent (Single Pipe)
Maximum Allow able Length of Vent/Flue Pipe (ft)
Pipe (4)
Unit Input
(inch)
1
2 61
70,000
3 71
2 61
90,000
3 71
(1) One 90° elbow should be secured to the combustion air intake connec-
tion.
(2) Minimum vent length is five feet and one elbow/tee.
(3) Tee used in the vent/flue termination must be included when determin-
ing the number of elbows in the piping system.
(4) 3" diameter pipe can be used in place of 2" diameter pipe.
V /F P T
ENT LUE IPE ERMINATIONS
The vent/flue pipe may terminate vertically, as through a roof, or
horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in the fol-
lowing figure. Refer to Section IX, Vent/Flue Pipe and Combustion
Air Pipe - Termination Locations for details concerning location re-
strictions. The penetration of the vent through the roof must be
sealed tight with proper flashing such as is used with a plastic plumb-
ing vent.
Horizontal vent/flue pipe terminations should be as shown in the
following figure. Refer to Section IX, Vent/Flue Pipe and Combus-
tion Air Pipe - Termination Locations for details concerning location
restrictions. A 2 3/8" diameter wall penetration is required for 2"
diameter pipe while a 3 1/2" diameter hole is required for 3" diam-
eter pipe. To secure the pipe passing through the wall and prohibit
damage to piping connections, a coupling should be installed on
either side of the wall and solvent cemented to a length of pipe
connecting the two couplings. The length of pipe should be the
wall thickness plus the depth of the socket fittings to be installed on
the inside and outside of the wall. The wall penetration should be
sealed with silicone caulking material.
In a basement installation, the vent/flue pipe can be run between
joist spaces. If the vent pipe must go below a joist and then up into
the last joist space to penetrate the header, two 45° elbows should
be used to reach the header rather than two 90° elbows.
IO-243
UPFLOW
(1)(2)
Number of Elbow s (3)
2 3 4 5 6 7
68 65 62 59 56 53 50
46 43 40 37 34 31 28
68 65 62 59 56 53 50
68 65 62 59 56 53 50
46 4 40 37 34 31 28
(1)(2)
Number of Elbow s (3)
2 3 4 5 6 7
58 55 52 49 46 43 40
68 65 62 59 56 53 50
58 55 52 49 46 43 40
68 65 62 59 56 53 50
8
8
Alternate Vertical Termination (Single Pipe)
ELBOW OR
COUPLING
Above Highest Anticipated Snow Level
D V
IRECT ENT
The inlet air screens provided in the installation instruction packet
are available for the installer to use in the inlet of the combustion air
pipe to prevent animals from building nests in the combustion air
pipe. The installation of the screens is not a requirement and will
not effect performance if not installed in the combustion air pipe.
Direct vent installations require both a combustion air intake and a
vent/flue pipe. The pipes may be run horizontally and exit through
the side of the building or run vertically and exit through the roof of
the building. The pipes may be run through an existing unused
chimney; however, they must extend a minimum of 12 inches above
the top of the chimney. The space between the pipes and the chim-
ney must be closed with a weather tight, corrosion resistant flash-
ing. Both the combustion air intake and a vent/flue pipe termina-
tions must be in the same atmospheric pressure zone. Refer to
Section IX, Vent/Flue and Combustion Air Pipe - Termination Loca-
16
TEE
12 " Min To
Highest Anticipated
Snow Level
Vertical Termination (Single Pipe)
MEDIUM RADIUS
ELBOWS
12" MIN.
TO ROOF OR
HIGHEST
ANTICIPATED
SNOW LEVEL
WALL
OUTSIDE
INSIDE
COUPLING
MIN.
12"
FROM
WALL
Horizontal Termination (Single Pipe)
12" MIN.
VENT/FLUE TEE
or
90° ELBOW TURNED
DOWN
12" MIN. ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL
Horizontal Termination (Single Pipe)
(D P ) P
UAL IPE IPING
Roof Or
90º
TEE
or
90°ELBOW
TURNED
DOWN
12"
TO GROUND OR
HIGHEST ANTICIPATED
SNOW LEVEL
6/04